/*
* A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
* Digest Algorithm, as defined in RFC 1321.
* Version 1.1 Copyright (C) Paul Johnston 1999 - 2002.
* Code also contributed by Greg Holt
* See http://pajhome.org.uk/site/legal.html for details.
*/



/*
* Add integers, wrapping at 2^32. This uses 16-bit operations internally
* to work around bugs in some JS interpreters.
*/

export default class Md5{

   safe_add(x, y) {

    var lsw = (x & 0xFFFF) + (y & 0xFFFF)
  
    var msw = (x >> 16) + (y >> 16) + (lsw >> 16)
  
    return (msw << 16) | (lsw & 0xFFFF)
  
  }
  
  
  
  /*
  * Bitwise rotate a 32-bit number to the left.
  */
  
   rol(num, cnt) {
  
    return (num << cnt) | (num >>> (32 - cnt))
  
  }
  
  
  
  /*
  * These functions implement the four basic operations the algorithm uses.
  */
  
   cmn(q, a, b, x, s, t) {
  
    return this.safe_add(this.rol(this.safe_add(this.safe_add(a, q), this.safe_add(x, t)), s), b)
  
  }
  
   ff(a, b, c, d, x, s, t) {
  
    return this.cmn((b & c) | ((~b) & d), a, b, x, s, t)
  
  }
  
   gg(a, b, c, d, x, s, t) {
  
    return this.cmn((b & d) | (c & (~d)), a, b, x, s, t)
  
  }
  
   hh(a, b, c, d, x, s, t) {
  
    return this.cmn(b ^ c ^ d, a, b, x, s, t)
  
  }
  
   ii(a, b, c, d, x, s, t) {
  
    return this.cmn(c ^ (b | (~d)), a, b, x, s, t)
  
  }
  
  
  
  /*
  * Calculate the MD5 of an array of little-endian words, producing an array
  * of little-endian words.
  */
  
   coreMD5(x) {
  
    var a = 1732584193
  
    var b = -271733879
  
    var c = -1732584194
  
    var d = 271733878
  
  
  
    for (var i = 0; i < x.length; i += 16) {
  
      var olda = a
  
      var oldb = b
  
      var oldc = c
  
      var oldd = d
  
  
  
      a = this.ff(a, b, c, d, x[i + 0], 7, -680876936)
  
      d = this.ff(d, a, b, c, x[i + 1], 12, -389564586)
  
      c = this.ff(c, d, a, b, x[i + 2], 17, 606105819)
  
      b = this.ff(b, c, d, a, x[i + 3], 22, -1044525330)
  
      a = this.ff(a, b, c, d, x[i + 4], 7, -176418897)
  
      d = this.ff(d, a, b, c, x[i + 5], 12, 1200080426)
  
      c = this.ff(c, d, a, b, x[i + 6], 17, -1473231341)
  
      b = this.ff(b, c, d, a, x[i + 7], 22, -45705983)
  
      a = this.ff(a, b, c, d, x[i + 8], 7, 1770035416)
  
      d =this. ff(d, a, b, c, x[i + 9], 12, -1958414417)
  
      c = this.ff(c, d, a, b, x[i + 10], 17, -42063)
  
      b = this.ff(b, c, d, a, x[i + 11], 22, -1990404162)
  
      a = this.ff(a, b, c, d, x[i + 12], 7, 1804603682)
  
      d = this.ff(d, a, b, c, x[i + 13], 12, -40341101)
  
      c =this. ff(c, d, a, b, x[i + 14], 17, -1502002290)
  
      b = this.ff(b, c, d, a, x[i + 15], 22, 1236535329)
  
  
  
      a = this.gg(a, b, c, d, x[i + 1], 5, -165796510)
  
      d = this.gg(d, a, b, c, x[i + 6], 9, -1069501632)
  
      c = this.gg(c, d, a, b, x[i + 11], 14, 643717713)
  
      b = this.gg(b, c, d, a, x[i + 0], 20, -373897302)
  
      a =this. gg(a, b, c, d, x[i + 5], 5, -701558691)
  
      d = this.gg(d, a, b, c, x[i + 10], 9, 38016083)
  
      c =this. gg(c, d, a, b, x[i + 15], 14, -660478335)
  
      b = this.gg(b, c, d, a, x[i + 4], 20, -405537848)
  
      a = this.gg(a, b, c, d, x[i + 9], 5, 568446438)
  
      d = this.gg(d, a, b, c, x[i + 14], 9, -1019803690)
  
      c =this. gg(c, d, a, b, x[i + 3], 14, -187363961)
  
      b = this.gg(b, c, d, a, x[i + 8], 20, 1163531501)
  
      a = this.gg(a, b, c, d, x[i + 13], 5, -1444681467)
  
      d =this. gg(d, a, b, c, x[i + 2], 9, -51403784)
  
      c = this.gg(c, d, a, b, x[i + 7], 14, 1735328473)
  
      b =this. gg(b, c, d, a, x[i + 12], 20, -1926607734)
  
  
  
      a = this.hh(a, b, c, d, x[i + 5], 4, -378558)
  
      d = this.hh(d, a, b, c, x[i + 8], 11, -2022574463)
  
      c = this.hh(c, d, a, b, x[i + 11], 16, 1839030562)
  
      b =this. hh(b, c, d, a, x[i + 14], 23, -35309556)
  
      a =this. hh(a, b, c, d, x[i + 1], 4, -1530992060)
  
      d =this. hh(d, a, b, c, x[i + 4], 11, 1272893353)
  
      c = this.hh(c, d, a, b, x[i + 7], 16, -155497632)
  
      b = this.hh(b, c, d, a, x[i + 10], 23, -1094730640)
  
      a = this.hh(a, b, c, d, x[i + 13], 4, 681279174)
  
      d = this.hh(d, a, b, c, x[i + 0], 11, -358537222)
  
      c = this.hh(c, d, a, b, x[i + 3], 16, -722521979)
  
      b = this.hh(b, c, d, a, x[i + 6], 23, 76029189)
  
      a =this. hh(a, b, c, d, x[i + 9], 4, -640364487)
  
      d = this.hh(d, a, b, c, x[i + 12], 11, -421815835)
  
      c = this.hh(c, d, a, b, x[i + 15], 16, 530742520)
  
      b = this.hh(b, c, d, a, x[i + 2], 23, -995338651)
  
  
  
      a = this.ii(a, b, c, d, x[i + 0], 6, -198630844)
  
      d = this.ii(d, a, b, c, x[i + 7], 10, 1126891415)
  
      c = this.ii(c, d, a, b, x[i + 14], 15, -1416354905)
  
      b = this.ii(b, c, d, a, x[i + 5], 21, -57434055)
  
      a = this.ii(a, b, c, d, x[i + 12], 6, 1700485571)
  
      d = this.ii(d, a, b, c, x[i + 3], 10, -1894986606)
  
      c = this.ii(c, d, a, b, x[i + 10], 15, -1051523)
  
      b = this.ii(b, c, d, a, x[i + 1], 21, -2054922799)
  
      a = this.ii(a, b, c, d, x[i + 8], 6, 1873313359)
  
      d = this.ii(d, a, b, c, x[i + 15], 10, -30611744)
  
      c = this.ii(c, d, a, b, x[i + 6], 15, -1560198380)
  
      b = this.ii(b, c, d, a, x[i + 13], 21, 1309151649)
  
      a = this.ii(a, b, c, d, x[i + 4], 6, -145523070)
  
      d = this.ii(d, a, b, c, x[i + 11], 10, -1120210379)
  
      c = this.ii(c, d, a, b, x[i + 2], 15, 718787259)
  
      b = this.ii(b, c, d, a, x[i + 9], 21, -343485551)
  
  
  
      a = this.safe_add(a, olda)
  
      b = this.safe_add(b, oldb)
  
      c = this.safe_add(c, oldc)
  
      d = this.safe_add(d, oldd)
  
    }
  
    return [a, b, c, d]
  
  }
  
  
  
  /*
  * Convert an array of little-endian words to a hex string.
  */
  
   binl2hex(binarray) {
  
    var hex_tab = "0123456789abcdef"
  
    var str = ""
  
    for (var i = 0; i < binarray.length * 4; i++) {
  
      str += hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8 + 4)) & 0xF) +
  
        hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8)) & 0xF)
  
    }
  
    return str
  
  }
  
  
  
  /*
  * Convert an array of little-endian words to a base64 encoded string.
  */

   binl2b64(binarray) {
  
    var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
  
    var str = ""
  
    for (var i = 0; i < binarray.length * 32; i += 6) {
  
      str += tab.charAt(((binarray[i >> 5] << (i % 32)) & 0x3F) |
  
        ((binarray[i >> 5 + 1] >> (32 - i % 32)) & 0x3F))
  
    }
  
    return str
  
  }
  
  
  
  /*
  * Convert an 8-bit character string to a sequence of 16-word blocks, stored
  * as an array, and append appropriate padding for MD4/5 calculation.
  * If any of the characters are >255, the high byte is silently ignored.
  */
  
   str2binl(str) {
  
    var nblk = ((str.length + 8) >> 6) + 1 // number of 16-word blocks  
  
    var blks = new Array(nblk * 16)
  
    for (var i = 0; i < nblk * 16; i++) blks[i] = 0
  
    for (var i = 0; i < str.length; i++)
  
      blks[i >> 2] |= (str.charCodeAt(i) & 0xFF) << ((i % 4) * 8)
  
    blks[i >> 2] |= 0x80 << ((i % 4) * 8)
  
    blks[nblk * 16 - 2] = str.length * 8
  
    return blks
  
  }
  
  
  
  /*
  * Convert a wide-character string to a sequence of 16-word blocks, stored as
  * an array, and append appropriate padding for MD4/5 calculation.
  */
  
   strw2binl(str) {
  
    var nblk = ((str.length + 4) >> 5) + 1 // number of 16-word blocks  
  
    var blks = new Array(nblk * 16)
  
    for (var i = 0; i < nblk * 16; i++) blks[i] = 0
  
    for (var i = 0; i < str.length; i++)
  
      blks[i >> 1] |= str.charCodeAt(i) << ((i % 2) * 16)
  
    blks[i >> 1] |= 0x80 << ((i % 2) * 16)
  
    blks[nblk * 16 - 2] = str.length * 16
  
    return blks
  
  }
  
  
  
  /*
  * External interface
  */
  
   hexMD5(str) { return this.binl2hex(this.coreMD5(this.str2binl(str))) }
  
   hexMD5w(str) { return this.binl2hex(this.coreMD5(this.strw2binl(str))) }
  
   b64MD5(str) { return this.binl2b64(this.coreMD5(this.str2binl(str))) }
  
   b64MD5w(str) { return this.binl2b64(this.coreMD5(this.strw2binl(str))) }
  
  /* Backward compatibility */
  
   calcMD5(str) { return this.binl2hex(this.coreMD5(this.str2binl(str))) }
  
}